Chair-attachable back support pillow



FIG. 1 is a front elevation view of a chair-attachable back support pillow showing my new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a right side elevation view thereof, the opposite side being a mirror image of the shown;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is an isometric view thereof. 

CLAIM The ornamental design for a chair-attachable back support pillow, as shown and described. 